import java.util.Scanner;

public class job1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("输入一个正整数");
        int num = in.nextInt();
        int i = 1;
        while (i <= num) {
            if (i * i == num) {
                System.out.println(num);
                break;
            }
            i++;
        }
        if (!(i * i == num)) {
            System.out.println("不是任何数的平方！");

        }
    }
}



